compudj - Slashdot User

Submission + - LTTng 2.13 facilitates quick reaction to kernel/user-space instrumentation hit (lttng.org)

Submitted by compudj on Tuesday August 03, 2021 @03:53PM

compudj writes: Today is the official release of LTTng 2.13 — Nordicité! LTTng is a kernel and user-space tracer for Linux. The most notable features of this release are:

Event-rule matches condition triggers and new actions, allowing internal actions or external monitoring applications to quickly react when kernel or user-space instrumentation is hit,
Notification payload capture, allowing external monitoring applications to read elements of the instrumentation payload when instrumentation is hit.
Instrumentation API: vtracef and vtracelog (LTTng-UST),
User space time namespace context (LTTng-UST and LTTng-modules).

Comment Junk science (Score 1) 486

by compudj on Wednesday March 25, 2015 @05:25PM (#49339517) Attached to: No, It's Not Always Quicker To Do Things In Memory

Wow. Has anyone heard about buffered writes ? And does kernel-level page cache ring a bell ? No fsync was ever used in the benchmarks, therefore, it is never actually hitting the disk. The only good thing about this paper is that the Java and Python listings are available at the end, for everyone to identify the basic flaws in this research.

So yeah, it's faster to write directly to MEMORY than to do a copy before writing to MEMORY.

Comment Flying with stopped engines ? (Score 1) 382

by compudj on Friday March 14, 2014 @01:45AM (#46480217) Attached to: Engine Data Reveals That Flight 370 Flew On For Hours After It "Disappeared"

Just a random though: has anyone checked how long, and over what distance, the plane could fly from its cruise altitude once its engines stop ? If, in such a situation, the pilots tried something similar to what has been done with flight 1549 (https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FUS_Airways_Flight_1549), it might be an interesting approach to try to approximate a circular search zone (rather than an area).

Submission + - Employer Demands Facebook Login from Job Applicant 2

Submitted by

Hugh Pickens writes

on Saturday February 19, 2011 @12:41PM

Hugh Pickens writes writes: "Alex Madrigal reports in the Atlantic that the ACLU has taken up the case of Maryland corrections officer Robert Collins who was required to provide his Facebook login and password to the Maryland Division of Corrections (DOC) during a recertification interview so the interviewer could log on to his account and read not only his postings, but those of his family and friends too. "We live in a time when national security is the highest priority, but it must be delicately balanced with personal privacy," says Collins. "My fellow officers and I should not have to allow the government to view our personal Facebook posts and those of our friends, just to keep our jobs." The ACLU of Maryland has sent a letter to Public Safety Secretary Gary Maynard (PDF) concerning the Division of Correction's blanket requirement that applicants for employment with the division, as well as current employees undergoing recertification, provide the government with their social media account usernames and personal passwords for use in employee background checks. After three weeks the ACLU has received no response."

Comment Re:Ubuntu Only? (Score 3, Informative) 88

by compudj on Saturday November 13, 2010 @01:01PM (#34216030) Attached to: Kernel Tracing With LTTng On Ubuntu Maverick

So far, LTTng has been mainly integrated in embedded distros: WindRiver Linux, Montavista Linux and STLinux currently ship with LTTng. The interesting news that is particular about Ubuntu here is that, by installing the LTTng packages from PPA, it is now possible to easily deploy the LTTng kernel and userspace tracers on a desktop-oriented distribution.

Comment K42: these problems were already tackled (Score 5, Informative) 462

by compudj on Thursday September 30, 2010 @01:36PM (#33749616) Attached to: Linux May Need a Rewrite Beyond 48 Cores

The K42 project at IBM Research investigated the benefit of a complete OS rewrite with scalability to very large SMP systems in mind. This is an open source operating system supporting Linux-compatible API and ABI.

Their target systems, "next generation SMP systems", back in 2003 seems to have become the current generation of SMP/multi-core systems in the meantime.

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